Tektronix 177 Bedienungsanleitung

177 STANDARD

TEST FIXTURE

SERVICE

COMMITTED

m EXCELLENCE

WARNING

THE

FOLLOWING SERVICING INSTRUCTIONS

ARE FOR USE BY QUALI

PERSONNEL ONLY.

AVOID PERSONAL INJURY, DO

NOT

PERFORM ANY SERVI

NG OTHER

THAN

THAT

CONTAINED

IN OPERATING INSTRUCTIONS

UNLESS YOU ARE QUALI

TO DO

SO.

Tektronix,

Inc.

P.O.

Box

500

Beaverton,

Oregon

97077

070-1472-00

Product Group 48

PLEASE CHECK FOR CHANGE INFORMATION

THE REAR OF THIS MANUAL.

177 STANDARD

TEST FIXTURE

SERVICE

INSTRUCTION

MANUAL

Serial

Number

_____

First Printing JUL 1973

Revised JUN 1983

1973

Tektronix,

Inc.

All

rights reserved.

Contents of this publication may not

reproduced

any

form without the written permission of Tektronix, Inc.

Products of Tektronix,

Inc.

and

its subsidiaries are covered

by U.S.

and

foreign patents and/or pending patents.

TEKTRONIX,

TEK,

SCOPE-MOBILE,

and

are

registered trademarks of Tektronix,

Inc.

TELEQUIPMENT

a registered trademark of Tektronix

U.K.

Limited.

Printed

U.S.A. Specification

and

price change privileges

are reserved.

INSTRUMENT SERIAL NUMBERS

Each

instrument has a serial number

pa~el

insert, tag,

or stamped

the chassis. The first number or letter

deSignates the country of manufacture.

The

last five digits

of the serial number are assigned sequentially and are

unique to

each

instrument. Those manufactured

the

United States have six unique digits. The country of

manufacture

identified

follows:

BOOOOOO

100000

200000

300000

700000

Tektronix, Inc., Beaverton, Oregon, USA

Tektronix Guernsey, Ltd., Channel Islands

Tektronix United Kingdom, Ltd., London

Sony/Tektronix, Japan

Tektronix Holland,

NV,

Heerenveen,

The Netherlands

SECTION 1

SECTION 2

SECTION 3

SECTION 4

SECTION 5

SECTION 6

SECTION 7

SECTION 8

TABLE

CONTENTS

SPECI

FICATION

Electrical Characteristics

Display

Amplifier

OPERATING

INFORMATION

Introduction

Preliminary

Controls

CIRCUIT DESCRIPTION

Introduction

Description

MAINTENANCE

Page

1-1

2-1

3-1

Introduction

4-1

Preventive Maintenance

General

4-1

Cleaning

4-1

Lubrication

4-1

Visual Inspection

4-1

Transistors

and

Integrated Circuits 4-2

Recalibration 4-2

Troubleshooting

Introduction

4-2

Troubleshooting Equipment 4-2

Troubleshooting Aids 4-2

Component Removal and Replacement

Removal

the

VERTICAL

CURRENT!DIV

Switch 4-3

Replacement

the

VERTICAL

CURRENT!DIV

Switch 4-5

Removal

Indicator Lamps

Repackaging

for

Shipment

CHECK

AND

ADJUSTMENT PROCEDURE

Introduction

Services Available

Test Equipment Required

Performance Check

Adjustment Procedure

ELECTRICAL PARTS LIST

DIAGRAMS

Symbols and Reference Designators

Voltage and Waveform Test Conditions

Circuit Board Illustrations

Diagrams

MECHANICAL

PARTS LIST

AND

ILLUSTRATIONS

4-5

5-1

5-4

CHANGE

INFORMATION

REV.

MAY. 1977

177 Service

Fixture.

177

Standard

Tes

Section

1-177

Service

SPECIFICATION

The

177

a plug-in test fixture designed

operate with

the

577

-D

1 or

Curve Tracer

form a system

measure the characteristics of a variety of two, three, and

four terminaIdevices.

The

177 features:

Two switch-selected sets

test jacks, permitting com-

parison tests.

Kelvin sensing

provide accurate measurements at high

current

levels.

A terminal selector switch

that

permits easy selection of

the various

test

configurations.

Vertical deflection factors ranging from 0.2 nA/DIV

2 A/DIV.

External front-panel jacks permitting access

the 577

step generator

output

and device-under-test base

(B)

and

emitter

(E) terminals.

A variable

-12,

+12 volt

output

and a looping

compensation control.

The 100 V,

400

V, and 1600 V collector ranges are

normally interlocked and are energized by closing

the

protective box cover

by pushing the interlock

defeat

button.

Only those voltages

that

are

not

interlocked are available

for Emitter-Base Leakage

Breakdown tests.

The

electrical and environmental characteristics shown

are valid for instruments operated

an ambient tempera-

ture

range from +1O°C (+50°F)

+40°C (104°F) after a

five-minute warmup,

calibrated

+20°C (+68°F)

+30°C (+86°F).

lECTR

ICAl

CHARACTERISTICS

Display

Amplifier

Accuracy (percent of highest on-screen value)

Vertical Collector Current: Total system accuracy of

the

577-177-D1

3%, unmagnified, and 4%,

magnified.

Deflection Factor, Vertical

Collector Current: 2 nA/DIV

2 AlDIV

a 1-2-5

sequence, unmagnified, and 0.2 nA/DIV

200

mAl

DIV, magnified.

1-1

Section

2-177

Service

OPERATING

INFORMATION

Introduction

The

177 Test Fixture operates with a Tektronix 577

Curve Tracer and

the

Display

Unit

as a system.

This section

the

manual gives a brief functional

description

the

front·panel controls of

the

177. See

the

577-177

-D

1 or

Operators Manual for a complete

operating procedure.

Preliminary

For initial preparation, refer

the

Operating Instruc-

tions

section of

the

577-177-D1 or D2 Operators Manual.

The

Operators Manual contains operating instructions,

well

general and specific application information.

Controls

This

a brief description of

the

functions of

the

front-panel controls. More detailed information is given

the

Operators Manual.

EMITTER GROUNDED MODE (Emitter terminal

grounded; Base terminal

switched as follows):

BASE TERM

STEP GEN

Applies step generator

output

the

base connec·

tions

the

test

fixture.

OPEN (OR EXT)

Disconnects

the

base terminal from

the

step

generator

output

and connects base terminal

the

front-panel EXT

BASE

INPUT

Connector.

SHORT

Disconnects

the

base terminal from

the

step

generator

output

and grounds

the

base terminal.

BASE GROUNDED MODE (Base terminal

grounded,

step generator polarity

inverted, and

the

em itter terminal

switched as follows):

ITTER TERM

OPEN (OR EXT)

Disconnects

the

emitter

terminal from

the

step

generator

output

and connects

the

emitter ter-

minal

the

front-panel EXT BASE OR

INPUT Connector.

STEP GEN

Applies step generator

output

the

em itter

terminal.

EMITTER-BASE BREAKDOWN

Grounds

the

base term

inal

and applies

the

collector

sweep voltage

the

emitter terminal. Only

the

collector·

voltage ranges

that

are

not

interlocked are available.

STEP GEN OUTPUT Connector

Provides external access

the

step generator

output.

EXT

BASE

Connector

Provides external access

the

base or emitter

term

ina

Is,

depending

the

position of

the

Terminal Selector switch.

GROUND

Provides for external ground connection.

LEFT-RIGHT Switch

Three position toggle switch for applying

test

signals

either

the

left

right set of terminal connectors.

The

center position disconnects all terminals

except

the

emitter

termina

Is.

The

emitter terminals are always connected

together and are connected

either ground,

the

step

generator, or

the

collector sweep depending

the

position of

the

Terminal Selector switch.

Test Adapter Terminal Jacks

Two sets

five recessed jacks accepting various adapters

for testing various sem iconductor devices.

2-1

Section

3-171

Service

CIRCUIT

DESCRIPTION

Introduction

This section of the manual contains a description of the

circuitry

the 177 Standard Test Fixture. Complete

schematic diagrams, with

component

numbers and parts

values, are shown on

the

pullout pages at

the

rear

this

manual.

Description

The

Standard

Test

Fixture contains

the

vertical pream-

plifier (variable gain)

that

measures voltage across a

current-sensing resistor.

The

entire vertical preamplifier, including its power

supply, floats with respect

ground. See Fig. 3-1.

The

vertical preamplifier consists

two FET source

followers,

0604A

and

a non-inverting feedback ampli-

fier, U616, and an inverting feedback amplifier, U624-

0626-0628,

which provides

the

1-2-5 current per division

switching.

The

inverting amplifier

output

connects

the

577 vertical amplifier.

Current sensing resistors, R

630

through R636, are

connected between

the

collector supply and

the

device

under test.

0604A

and B (source followers) are connected across

the

current-sensing resistors, and

the

source-follower out-

puts are fed differentially

616,

the

X10 amplifier.

R612

the

input

resistor for U616; R616 and R615

(Gain Adj) make up

the

feedback resistor.

The

gain

set

for slightly more than 10,

compensate for

the

FET

source-follower losses.

C632, LOOPING COMPENSATION (front-panel con-

troll.

compensates for stray capacitance

0604B

gate and

the

test

adapter, as well as some

the

device-under-test

capacitance.

C630 and R660 through R665 (ganged with

the

current-sensing resistors, R630 through R636), compensate

REV.

MAR.

1975

for

the

stray capacitance across

the

current sensing resis-

tors, keeping

the

time

constant

similar

the

time

constant

the

stray capacitance and R630 through R636.

U616

output

connected

a 10:1 divider,

R618-R619. This divider

output

connected

the

horizontal

attenuator

the

low-current ranges

the

VERTICAL CURRENT/DIV switch

nA/DIV

2 mA/DIV). This voltage

the

horizontal

attenuator

the

same

the

voltage on

the

collector of

the

device under

test. This method permits monitoring

the

collector voltage

without

drawing

current

through

the

current-sensing

resistor.

On the high-current ranges

mA/DIV

2 A/DIV)

the

horizontal

attenuator

connected directly

the

collector

sense terminal of

the

device under

test

permit Kelvin

sensing. If Kelvin sensing

not

used,

the

22.Q

resistor

between C and C SENSE terminals connects

the

horizontal

attenuator

the

term

ina

Is.

U616

output

connected

the

inverting amplifier,

U624-0626-0628.

The

input

resistance

R621 and

the

feedback resistance

composed of three resistors, R627

(gain of

R627 and R628

parallel (gain of

2.5L

and

R627

parallel with R629 (gain

1).

The inverting amplifier,

U624-0626-0628,

connected

J110,

the

vertical amplifier via pin 4

P129.

0626-0628

provide low-output impedance

prevent signal load

ing

the

chopper

circuit.

All

power

supplied by

the

floating 0+15 and

0-15-volt

supplies. 0 (test fixture common)

connected

the

junction

the

collector supply and

the

current

sensing

resistors.

When using

the

177

Test

Fixture

the

577,

the

highest

ranges of

the

MAX

PEAK VOLTS switch

(100V,

400

and 1600

are

not

enabled unless

the

protective cover

placed over

the

test

adapter

the

interlock

defeat

button

depressed. When

the

cover

closed,

S626

closed and

permits these three ranges

enabled.

3-1

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